Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
The temperature coming out of your AHU for system 5-7 should be the temperature required for cooling in the space, which is generally 20F lower than setpoint temperature according to G3.1.2.8 Design airflow rates in appendix G. So in order for your room to meet setpoint in cooling mode the heating coil in the AHU should be set to the same temperature, otherwise you have simultaneous heating and cooling in your AHU. The reheat coils will then take care of meeting temperature when heating is required.
There is one more rule to be aware of in Appendix G G3.1.3.12 Supply air Temperature reset: "the air temperature for cooling shall be reset higher by 5F under the minimum cooling load conditions" and so if you are setting your heating coil at the same temperature as your cooling coil, during minimum load these temperatures need to be raised by 5F
